Copper Barium/Zinc Purple Glaze

In the book "The Ceramic Spectrum" by Robin Hopper, he states that
copper can produce a purple and plum color in both oxidation and
reduction, cone 6 thru 10 in high alkaline or barium/zinc glazes. I
was wondering if anyone out there is familiar with this coloring from
copper. Anyone have a recipe? I would like to run some tests on this
type of glaze. If I had a proven recipe as a starting point, I could
probably save countless tests narrowing in on a workable glaze.
Also, I wonder if strontium could replace the barium and still retain
the coloring. Any hints? Thanks. - Mike
Reply to
mike
i've used laguna clay's "turquoise matt" for cone 10 reduction fires. it contains some of what you mention. i don't know the details, but when i have pieces slightly underfired they take on more purple.
fast cooling also seems to freeze reds in place that otherwise seem to settle out into less of a red in slower cooling kilns.
i used to have a kiln that could hit cone 10 in 4 hours, and cool off in 1 1/2 hours. (i could do two cone 10 fires in a day). i used to deliberately place redish glazed pieces next to this glaze and seemed to get vapour deposits from one glaze over to this turquoise glaze.
possibly laguna clay can shed light on how the glaze is formed.
see ya
steve
Reply to
slgraber
Most copper glazes will produce 'plumy' reds in reduction but I think similar colours in oxidation would make use of cadmium. Andy
Reply to
plodder

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